Exotic Birds of the Galapagos Islands (Nazca Boobies)

Formerly known as Masked (White) Boobies, this native sea bird has one of the most intriguing behaviors in the animal world.

Nazca Boobies belong to the Sulidae family (Order Pelicaniformes), and are part of the three gannet species of the Archipelago.

Nazca Boobies (Masked Boobies)

This species of booby nests mainly along the edges of the shoreline, although nesting areas like Tower Island in Galapagos, may have them as far as 100 meters inland (some 300 feet).

Unlike blue-footed boobies, they have a fixed mating season with one peculiar situation: sibling murder. More about Blue Footed Boobies here

Siblicide is not uncommon in avian life. In fact, herons, cranes, and even egrets perform it.

It seems the reason for siblicide lies in the rigidity of their fixed mating season.

Producing an egg is hard to start with. more so if two are laid.

If they lay only one egg, and something happens to that single egg, there will be an uphill climb if you are to lay another one and rear it successfully.

Therefore, ethics forgotten, siblicide seems to be the key for survival and a clear evolutionary advantage.

This system works in a non-conflict environment, since the laying of the two eggs is about 4-5 days apart (thus, the hatching of the eggs is at different days).

Chicks will have different sizes where the older is larger by about 30%.

This makes a crucial difference at feeding time, since the larger chick has a clear advantage versus its smaller sibling.

Pushing the younger one out of the nest (siblicide) gets rid of the potential competition, but more so, it increases the survival ratio of the staying sibling by 50%.

Cruel or not, it doesn't matter...

Survival matters, and it is the only mechanism that allows species to have a chance to pass on their genes to a next generation.

Best nesting colonies for observing these birds of the Galapagos Islands (Nazca Boobies) are in the following locations:

• Genovesa Island (Tower)
• Hood Island (Española)
• and Floreana Island

Galapagos Recommended Reading:

Kindle Wireless Reading Device
KINDLE is the #1 bestselling item for two years running. You can start reading books in less than 60 seconds. (No computer required).

A Traveler's Guide to the Galapagos Islands
This book reviews the Galapagos Islands' history, explains its ecology and the evolution of its wildlife, and tells where to go and what to see and photograph. (This is a helpful and easy to read guide)

More About Galapagos

Blue Footed Boobies Birds

Flights to Galapagos

Best Galapagos Hotel

Economic Galapagos Trips

Search this Site for More Galapagos Information

Custom Search